Question Regarding sources.list

[Chris Debian <csgdebian2020@gmail.com>]

Good Afternoon,

I recently installed Debian Bullseye with the unofficial iso that
includes non-free firmware
(debian-live-testing-amd64-xfce+nonfree.iso).

However, my sources.list file does not contain "contrib" or "non-free"
components. Should "contrib" and "non-free" components be added to all
of the archives to ensure system and firmware are up-to-date with
security updates, etc?

I am a complete beginner. My apologies if this question seems obvious.
My sources.list files is below:

# See https://wiki.debian.org/SourcesList for more information.
deb http://deb.debian.org/debian/ bullseye main
deb-src http://deb.debian.org/debian/ bullseye main

deb http://deb.debian.org/debian/ bullseye-updates main
deb-src http://deb.debian.org/debian/ bullseye-updates main

deb http://security.debian.org/debian-security/ bullseye-security main
deb-src http://security.debian.org/debian-security/ bullseye-security main

Thank you,
Chris